William w



(No Model.)

W. W. GREEN.

MACHINE FOE BENDING SPIRAL GONVEYE'RS No. 398,505. Patented Nov. 27, 1888.

UNITED STATES PATENT OFFICE.

\VILLIAM W. GREEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO BENJAMIN F. RYER, OF SAME PLACE.

MACHINE FOR BENDING SPIRAL CONVEYERS.

SPECIFICATION forming part of Letters Patent No. 393,505, dated November 27, 1888,

(No model.)

To all whom it may concern:

Be it known that l, WILLIAM W. GREEN, of Chicago, county of Cook, and State of Illinois, have invented certain new and useful In1- provements in a Machine for Forming Spiral Flights for Screw-Conveyors, of which the following is a full, clear. and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, forming a part of this specifieation.

The object of this invention is to provide a simple and convenient machine whereby a strip or ribbon of metal may be torsionally wound or coiled to form a spiral flight from a continuous piece preparatory to mounting the same on a permanent shaft or core in the manufacture of screw-conveyers.

Figure 1 is a front elevation of a machine embodying my improved features. Fig. 2 is a transverse section in the plane 2, Fig. 1. Fig. 3 is a transverse section in the same plane with a portion of the revolving forming-head broken, showing the means employed to rigidly secure one end of the metal ribbon in forming the spiral flight; and Fig. 4, a view in perspective of the forming head illustrated in Fig. 3.

In the drawings, A A represent the two vertical ends forming the supporting-frame, and A a horizontal tool-rest or feed-table connecting the same.

The back end of the maudrelshaft B is pro vided with a suitable journal-bearing, a, in part A of the frame, while the opposite end is supported by the tail or centering hand-screw a inserted in the top part,a,of the frame part A, as illustrated in Fig. 1. Motion is transmitted to the mandrel through the medium of the gear-wheel B, the pinion B being mounted on the counter-shaft B and engaging with said gear-wheel, the band-pulley a receiving the belt from the motive power. One end ofthe counter-shaft B is journaled in the bearing stand I) and the opposite end in the frame A.

The clamping-head or chuck C is rigidly mounted on the mandrehwhile the companion head 0 is loosely mounted and does not rotate. That portion of the mandrel between the head C and the tail-screw is provided with a left-handed screw-thread, b.

The hand or feed nut D is correspondingly screw threaded, so .as to engage with the threaded portion of the mandrel. In operation this nut bears close against the outside of the head 0, the handle I) of said nut having a bearing on the feed-table, so as to prevent the nut from rotating with the mandrel.

The clamping-head C is provided with the spiral or cam face d, as shown in Fig. 4, and turns toward the operator, as indicated by the arrow, the ribbon of metallirst coming in contact with the lowest part of the face d. The angle of the face or surface d corresponds to that of the thickness of the metal ribbon, or nearly so, and imparts about the same degree of pitch to the spiral formation. The head C is also provided with the lockingrecess d, in which the end of the metal ribbon or strip E is inserted, (see Fig. 3,) first being bent to the proper angle to bring the side of the metal strip-flat against the face (I. The end of the strip inserted in the recess (2 is firmly secured in place by the set-screw (i The strip or ribbon of metal is fed through the former or guide F,which is provided with the passage-slot f.

In operation the strip of metal is first properly inserted and secured in the disk-head G, and the companion head is next set close up to the same, as shown in Fig. 1. The mandrel being now put in motion,the strip of metal is drawn through the former or guide F and wound into a spiral coil. The nut D moves toward the tailscrew, the head 0 following, being crowded away from the rotating head 0 by the pressure of the forming coil. The screwthreads on the mandrel correspond to the thickness of the stock from which the flight is formed. A spiral flight formed in this manner will be somewhat compact, but is adapted to be spread apart when being mounted on a permanent shaft and set at any desired pitch.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the character described, a disk clamping'head having a spiral or cam face and provided with the recess d, substantially as and for the purpose set forth.

2. The combination, with the mandrel-shaft B, of the disk clamping-head C, rigidly mount- 13, suitably supported at each end, and the means described for imparting a rotary motion to the same, of the clamping-head C, rigidly mounted on said shaft and having a spi ral or cam face, the companion head 0, loosely mounted on said shaft, the hand-nut D, having a threaded engagement with said shaft, and the former or guide F, provided with the slot f, all combined and arranged to operate substantially as and for the purpose set forth.

XVILLIAM V. GREEN. Vitnesses:

L. M. FREEMAN, L. B. COUPLAND. 

